using System;
using System.Collections.Generic;
using System.IO;

namespace CMS_CORE.Utils
{
    public static class Nc_Utils
    {
        //-------------------------------------------------------------------------------------------------------------------------------------------------
        // NC <-> .NET Conversions

        // INT -> 2 WORD
        public static void IntTOWord(int IntVal, out ushort LowWord, out ushort HighWord)
        {
            byte[] bytes = BitConverter.GetBytes(IntVal);

            //Split into 2 word
            LowWord = BitConverter.ToUInt16(bytes, 0);
            HighWord = BitConverter.ToUInt16(bytes, 2);
        }

        // 2 WORD -> INT
        public static void WordTOInt(out int IntVal, ushort LowWord, ushort HighWord)
        {
            byte[] bytes = new byte[4];

            //fill the bytes from 2 word
            bytes[0] = BitConverter.GetBytes(LowWord)[0];
            bytes[1] = BitConverter.GetBytes(LowWord)[1];
            bytes[2] = BitConverter.GetBytes(HighWord)[0];
            bytes[3] = BitConverter.GetBytes(HighWord)[1];

            //Create the value
            IntVal = BitConverter.ToInt32(bytes, 0);
        }

        // INT -> 2 WORD (LIST)
        public static List<ushort> IntTOWordList(List<int> UintVal)
        {
            ushort low, high;

            //initialize the new List
            List<ushort> Word = new List<ushort>();

            //Fill the List
            foreach (int val in UintVal)
            {
                IntTOWord(val, out low, out high);
                Word.Add(low);
                Word.Add(high);
            }

            return Word;
        }

        // 2 WORD -> INT (LIST)
        public static List<int> WordTOIntList(List<ushort> UintVal)
        {
            int value;

            //initialize the new List
            List<int> Int = new List<int>();

            //Fill the List
            for (int i = 0; i < UintVal.Count; i = i + 2)
            {
                WordTOInt(out value, UintVal[i], UintVal[i + 1]);
                Int.Add(value);
            }

            return Int;
        }

        //-------------------------------------------------------------------------------------------------------------------------------------------------
        // NC <-> .NET Conversions

        // UINT -> 2 WORD
        public static void UIntTOWord(uint UintVal, out ushort LowWord, out ushort HighWord)
        {
            byte[] bytes = BitConverter.GetBytes(UintVal);

            //Split into 2 word
            LowWord = BitConverter.ToUInt16(bytes, 0);
            HighWord = BitConverter.ToUInt16(bytes, 2);
        }

        // 2 WORD -> UINT
        public static void WordTOUint(out uint UintVal, ushort LowWord, ushort HighWord)
        {
            byte[] bytes = new byte[4];

            //fill the bytes from 2 word
            bytes[0] = BitConverter.GetBytes(LowWord)[0];
            bytes[1] = BitConverter.GetBytes(LowWord)[1];
            bytes[2] = BitConverter.GetBytes(HighWord)[0];
            bytes[3] = BitConverter.GetBytes(HighWord)[1];

            //Create the value
            UintVal = BitConverter.ToUInt32(bytes, 0);
        }

        // UINT -> 2 WORD (LIST)
        public static List<ushort> UIntTOWordList(List<uint> UintVal)
        {
            ushort low, high;

            //initialize the new List
            List<ushort> Word = new List<ushort>();

            //Fill the List
            foreach (uint val in UintVal)
            {
                UIntTOWord(val, out low, out high);
                Word.Add(low);
                Word.Add(high);
            }

            return Word;
        }

        // 2 WORD -> UINT (LIST)
        public static List<uint> WordTOUintList(List<ushort> UintVal)
        {
            uint value;

            //initialize the new List
            List<uint> Uint = new List<uint>();

            //Fill the List
            for (int i = 0; i < (UintVal.Count / 2); i = i + 2)
            {
                WordTOUint(out value, UintVal[i], UintVal[i + 1]);
                Uint.Add(value);
            }

            return Uint;
        }

        public static void WriteLocalFile(string fileContent, ref FileStream fileReference)
        {
            // Write Part Program
            using (StreamWriter writer = new StreamWriter(fileReference))
                writer.Write(fileContent);
        }

        public static string ReadLocalFile(FileStream fileReference)
        {
            // Get File Content
            StreamReader reader = new StreamReader(fileReference);

            string fileContent = reader.ReadToEnd();

            return fileContent;
        }


        public static string GetUntilOrEmpty(string text, string stopAt = "[")
        {
            // Get string unti
            if (!String.IsNullOrWhiteSpace(text))
            {
                // Find character index
                int charLocation = text.IndexOf(stopAt, StringComparison.Ordinal);

                if (charLocation > 0)
                    return text.Substring(0, charLocation);
            }

            return String.Empty;
        }

        public static IEnumerable<TSource> DistinctBy<TSource, TKey> (this IEnumerable<TSource> source, Func<TSource, TKey> keySelector)
        {
            HashSet<TKey> seenKeys = new HashSet<TKey>();
            foreach (TSource element in source)
            {
                if (seenKeys.Add(keySelector(element)))
                {
                    yield return element;
                }
            }
        }
    }
}